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Solvation and Cation Competition in Mixed Hydroxide Brines.

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Highly alkaline brines with lithium hydroxide (LiOH) show distinct solvation behaviors near saturation. This research details ion dynamics in concentrated KOH/LiOH and KOH/NaOH mixtures for energy storage applications.

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Area of Science:

  • Electrochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Highly alkaline brines are crucial for energy storage and industrial electrolysis.
  • Limited physicochemical data exists for concentrated LiOH mixtures, hindering model development.

Purpose of the Study:

  • To investigate ion association, solvation dynamics, and transport in KOH/LiOH and KOH/NaOH mixtures.
  • To contrast the behavior of Li+ and Na+ as co-cations in these brines.
  • To understand solution structure evolution approaching Li+ saturation.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) spectroscopy (chemical shift, relaxation).
  • Measured physical properties: diffusivity, ionic conductivity, density, and viscosity.
  • Examined ionic strengths from 1 to 9 M in mixed alkali cation systems.

Main Results:

  • Detailed understanding of hydroxide affinity for Li+, Na+, and K+.
  • Observed distinct solvation regimes in mixed cation electrolytes above 6 M ionic strength.
  • Characterized solution structure changes as LiOH approaches saturation.

Conclusions:

  • LiOH mixtures exhibit unique solvation dynamics compared to NaOH mixtures.
  • Findings provide critical data for physics-based modeling of concentrated electrolytes.
  • Operational limits for energy storage and electrolysis can be better defined.